Free tools

Grow tools

Free calculators and planners for indoor growers. Work out what size kit you actually need, what it will cost to run, and what to fix when something goes wrong. No sign-up, and every result has a link you can save.

Plan your grow

Grow tent size calculator How much space you need, or how many plants fit the space you have. In development
Grow light calculator The wattage and number of fixtures your tent needs. In development
Hydroponic system selector Which system suits you, and what reservoir size it needs. In development

Choose your equipment

Extraction fan and carbon filter calculator The extraction, duct size and filter rating your tent needs, plus kit that fits. Open the tool2 min
Complete setup builder A full, compatibility-checked kit list for your space and budget. In development

Calculate running costs

Running cost calculator What your grow room costs to run, in kWh and pounds, at your tariff. In development
HPS to LED savings calculator What switching would save you, and how long it takes to pay for itself. In development

Troubleshoot your setup

Plant problem diagnostic Work back from the symptom to the cause, and what fixes it. In development
VPD calculator Whether your temperature and humidity suit the growth stage. In development
Nutrient dose calculator How much of each bottle for your reservoir and week. In development

These tools are built around what we stock, so the numbers they give you are matched against kit you can actually buy in the UK, at the price it costs today. Every recommendation explains why it was made.